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<h1 id="NAME">NAME</h1>

<p>RSA_meth_get0_app_data, RSA_meth_set0_app_data, RSA_meth_new, RSA_meth_free, RSA_meth_dup, RSA_meth_get0_name, RSA_meth_set1_name, RSA_meth_get_flags, RSA_meth_set_flags, RSA_meth_get_pub_enc, RSA_meth_set_pub_enc, RSA_meth_get_pub_dec, RSA_meth_set_pub_dec, RSA_meth_get_priv_enc, RSA_meth_set_priv_enc, RSA_meth_get_priv_dec, RSA_meth_set_priv_dec, RSA_meth_get_mod_exp, RSA_meth_set_mod_exp, RSA_meth_get_bn_mod_exp, RSA_meth_set_bn_mod_exp, RSA_meth_get_init, RSA_meth_set_init, RSA_meth_get_finish, RSA_meth_set_finish, RSA_meth_get_sign, RSA_meth_set_sign, RSA_meth_get_verify, RSA_meth_set_verify, RSA_meth_get_keygen, RSA_meth_set_keygen, RSA_meth_get_multi_prime_keygen, RSA_meth_set_multi_prime_keygen - Routines to build up RSA methods</p>

<h1 id="SYNOPSIS">SYNOPSIS</h1>

<pre><code> #include &lt;openssl/rsa.h&gt;

 RSA_METHOD *RSA_meth_new(const char *name, int flags);
 void RSA_meth_free(RSA_METHOD *meth);

 RSA_METHOD *RSA_meth_dup(const RSA_METHOD *meth);

 const char *RSA_meth_get0_name(const RSA_METHOD *meth);
 int RSA_meth_set1_name(RSA_METHOD *meth, const char *name);

 int RSA_meth_get_flags(const RSA_METHOD *meth);
 int RSA_meth_set_flags(RSA_METHOD *meth, int flags);

 void *RSA_meth_get0_app_data(const RSA_METHOD *meth);
 int RSA_meth_set0_app_data(RSA_METHOD *meth, void *app_data);

 int (*RSA_meth_get_pub_enc(const RSA_METHOD *meth))(int flen, const unsigned char *from,
                                                     unsigned char *to, RSA *rsa, int padding);
 int RSA_meth_set_pub_enc(RSA_METHOD *rsa,
                          int (*pub_enc)(int flen, const unsigned char *from,
                                         unsigned char *to, RSA *rsa,
                                         int padding));

 int (*RSA_meth_get_pub_dec(const RSA_METHOD *meth))
     (int flen, const unsigned char *from,
      unsigned char *to, RSA *rsa, int padding);
 int RSA_meth_set_pub_dec(RSA_METHOD *rsa,
                          int (*pub_dec)(int flen, const unsigned char *from,
                                         unsigned char *to, RSA *rsa,
                                         int padding));

 int (*RSA_meth_get_priv_enc(const RSA_METHOD *meth))(int flen, const unsigned char *from,
                                                      unsigned char *to, RSA *rsa,
                                                      int padding);
 int RSA_meth_set_priv_enc(RSA_METHOD *rsa,
                           int (*priv_enc)(int flen, const unsigned char *from,
                                           unsigned char *to, RSA *rsa, int padding));

 int (*RSA_meth_get_priv_dec(const RSA_METHOD *meth))(int flen, const unsigned char *from,
                                                      unsigned char *to, RSA *rsa,
                                                      int padding);
 int RSA_meth_set_priv_dec(RSA_METHOD *rsa,
                           int (*priv_dec)(int flen, const unsigned char *from,
                                           unsigned char *to, RSA *rsa, int padding));

 /* Can be null */
 int (*RSA_meth_get_mod_exp(const RSA_METHOD *meth))(BIGNUM *r0, const BIGNUM *i,
                                                     RSA *rsa, BN_CTX *ctx);
 int RSA_meth_set_mod_exp(RSA_METHOD *rsa,
                          int (*mod_exp)(BIGNUM *r0, const BIGNUM *i, RSA *rsa,
                                         BN_CTX *ctx));

 /* Can be null */
 int (*RSA_meth_get_bn_mod_exp(const RSA_METHOD *meth))(BIGNUM *r, const BIGNUM *a,
                                                        const BIGNUM *p, const BIGNUM *m,
                                                        BN_CTX *ctx, BN_MONT_CTX *m_ctx);
 int RSA_meth_set_bn_mod_exp(RSA_METHOD *rsa,
                             int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a,
                                               const BIGNUM *p, const BIGNUM *m,
                                               BN_CTX *ctx, BN_MONT_CTX *m_ctx));

 /* called at new */
 int (*RSA_meth_get_init(const RSA_METHOD *meth) (RSA *rsa);
 int RSA_meth_set_init(RSA_METHOD *rsa, int (*init (RSA *rsa));

 /* called at free */
 int (*RSA_meth_get_finish(const RSA_METHOD *meth))(RSA *rsa);
 int RSA_meth_set_finish(RSA_METHOD *rsa, int (*finish)(RSA *rsa));

 int (*RSA_meth_get_sign(const RSA_METHOD *meth))(int type, const unsigned char *m,
                                                  unsigned int m_length,
                                                  unsigned char *sigret,
                                                  unsigned int *siglen, const RSA *rsa);
 int RSA_meth_set_sign(RSA_METHOD *rsa,
                       int (*sign)(int type, const unsigned char *m,
                                   unsigned int m_length, unsigned char *sigret,
                                   unsigned int *siglen, const RSA *rsa));

 int (*RSA_meth_get_verify(const RSA_METHOD *meth))(int dtype, const unsigned char *m,
                                                    unsigned int m_length,
                                                    const unsigned char *sigbuf,
                                                    unsigned int siglen, const RSA *rsa);
 int RSA_meth_set_verify(RSA_METHOD *rsa,
                         int (*verify)(int dtype, const unsigned char *m,
                                       unsigned int m_length,
                                       const unsigned char *sigbuf,
                                       unsigned int siglen, const RSA *rsa));

 int (*RSA_meth_get_keygen(const RSA_METHOD *meth))(RSA *rsa, int bits, BIGNUM *e,
                                                    BN_GENCB *cb);
 int RSA_meth_set_keygen(RSA_METHOD *rsa,
                         int (*keygen)(RSA *rsa, int bits, BIGNUM *e,
                                       BN_GENCB *cb));

 int (*RSA_meth_get_multi_prime_keygen(const RSA_METHOD *meth))(RSA *rsa, int bits,
                                                                int primes, BIGNUM *e,
                                                                BN_GENCB *cb);

 int RSA_meth_set_multi_prime_keygen(RSA_METHOD *meth,
                                     int (*keygen) (RSA *rsa, int bits,
                                                    int primes, BIGNUM *e,
                                                    BN_GENCB *cb));</code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p>The <b>RSA_METHOD</b> type is a structure used for the provision of custom RSA implementations. It provides a set of functions used by OpenSSL for the implementation of the various RSA capabilities. See the <a href="/../man1/rsa.html">rsa</a> page for more information.</p>

<p>RSA_meth_new() creates a new <b>RSA_METHOD</b> structure. It should be given a unique <b>name</b> and a set of <b>flags</b>. The <b>name</b> should be a NULL terminated string, which will be duplicated and stored in the <b>RSA_METHOD</b> object. It is the callers responsibility to free the original string. The flags will be used during the construction of a new <b>RSA</b> object based on this <b>RSA_METHOD</b>. Any new <b>RSA</b> object will have those flags set by default.</p>

<p>RSA_meth_dup() creates a duplicate copy of the <b>RSA_METHOD</b> object passed as a parameter. This might be useful for creating a new <b>RSA_METHOD</b> based on an existing one, but with some differences.</p>

<p>RSA_meth_free() destroys an <b>RSA_METHOD</b> structure and frees up any memory associated with it.</p>

<p>RSA_meth_get0_name() will return a pointer to the name of this RSA_METHOD. This is a pointer to the internal name string and so should not be freed by the caller. RSA_meth_set1_name() sets the name of the RSA_METHOD to <b>name</b>. The string is duplicated and the copy is stored in the RSA_METHOD structure, so the caller remains responsible for freeing the memory associated with the name.</p>

<p>RSA_meth_get_flags() returns the current value of the flags associated with this RSA_METHOD. RSA_meth_set_flags() provides the ability to set these flags.</p>

<p>The functions RSA_meth_get0_app_data() and RSA_meth_set0_app_data() provide the ability to associate implementation specific data with the RSA_METHOD. It is the application&#39;s responsibility to free this data before the RSA_METHOD is freed via a call to RSA_meth_free().</p>

<p>RSA_meth_get_sign() and RSA_meth_set_sign() get and set the function used for creating an RSA signature respectively. This function will be called in response to the application calling RSA_sign(). The parameters for the function have the same meaning as for RSA_sign().</p>

<p>RSA_meth_get_verify() and RSA_meth_set_verify() get and set the function used for verifying an RSA signature respectively. This function will be called in response to the application calling RSA_verify(). The parameters for the function have the same meaning as for RSA_verify().</p>

<p>RSA_meth_get_mod_exp() and RSA_meth_set_mod_exp() get and set the function used for CRT computations.</p>

<p>RSA_meth_get_bn_mod_exp() and RSA_meth_set_bn_mod_exp() get and set the function used for CRT computations, specifically the following value:</p>

<pre><code> r = a ^ p mod m</code></pre>

<p>Both the mod_exp() and bn_mod_exp() functions are called by the default OpenSSL method during encryption, decryption, signing and verification.</p>

<p>RSA_meth_get_init() and RSA_meth_set_init() get and set the function used for creating a new RSA instance respectively. This function will be called in response to the application calling RSA_new() (if the current default RSA_METHOD is this one) or RSA_new_method(). The RSA_new() and RSA_new_method() functions will allocate the memory for the new RSA object, and a pointer to this newly allocated structure will be passed as a parameter to the function. This function may be NULL.</p>

<p>RSA_meth_get_finish() and RSA_meth_set_finish() get and set the function used for destroying an instance of an RSA object respectively. This function will be called in response to the application calling RSA_free(). A pointer to the RSA to be destroyed is passed as a parameter. The destroy function should be used for RSA implementation specific clean up. The memory for the RSA itself should not be freed by this function. This function may be NULL.</p>

<p>RSA_meth_get_keygen() and RSA_meth_set_keygen() get and set the function used for generating a new RSA key pair respectively. This function will be called in response to the application calling RSA_generate_key_ex(). The parameter for the function has the same meaning as for RSA_generate_key_ex().</p>

<p>RSA_meth_get_multi_prime_keygen() and RSA_meth_set_multi_prime_keygen() get and set the function used for generating a new multi-prime RSA key pair respectively. This function will be called in response to the application calling RSA_generate_multi_prime_key(). The parameter for the function has the same meaning as for RSA_generate_multi_prime_key().</p>

<p>RSA_meth_get_pub_enc(), RSA_meth_set_pub_enc(), RSA_meth_get_pub_dec(), RSA_meth_set_pub_dec(), RSA_meth_get_priv_enc(), RSA_meth_set_priv_enc(), RSA_meth_get_priv_dec(), RSA_meth_set_priv_dec() get and set the functions used for public and private key encryption and decryption. These functions will be called in response to the application calling RSA_public_encrypt(), RSA_private_decrypt(), RSA_private_encrypt() and RSA_public_decrypt() and take the same parameters as those.</p>

<h1 id="RETURN-VALUES">RETURN VALUES</h1>

<p>RSA_meth_new() and RSA_meth_dup() return the newly allocated RSA_METHOD object or NULL on failure.</p>

<p>RSA_meth_get0_name() and RSA_meth_get_flags() return the name and flags associated with the RSA_METHOD respectively.</p>

<p>All other RSA_meth_get_*() functions return the appropriate function pointer that has been set in the RSA_METHOD, or NULL if no such pointer has yet been set.</p>

<p>RSA_meth_set1_name and all RSA_meth_set_*() functions return 1 on success or 0 on failure.</p>

<h1 id="SEE-ALSO">SEE ALSO</h1>

<p><a href="../man3/RSA_new.html">RSA_new(3)</a>, <a href="../man3/RSA_generate_key_ex.html">RSA_generate_key_ex(3)</a>, <a href="../man3/RSA_sign.html">RSA_sign(3)</a>, <a href="../man3/RSA_set_method.html">RSA_set_method(3)</a>, <a href="../man3/RSA_size.html">RSA_size(3)</a>, <a href="../man3/RSA_get0_key.html">RSA_get0_key(3)</a>, <a href="../man3/RSA_generate_multi_prime_key.html">RSA_generate_multi_prime_key(3)</a></p>

<h1 id="HISTORY">HISTORY</h1>

<p>RSA_meth_get_multi_prime_keygen() and RSA_meth_set_multi_prime_keygen() were added in OpenSSL 1.1.1.</p>

<p>Other functions described here were added in OpenSSL 1.1.0.</p>

<h1 id="COPYRIGHT">COPYRIGHT</h1>

<p>Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.</p>

<p>Licensed under the OpenSSL license (the &quot;License&quot;). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>


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